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A portion of the Interstate 5 bridge is submerged after it collapsed into the Skagit River dumping vehicles and people into the water in Mount Vernon, Wash., Thursday, May 23, 2013. (AP Photo/The Seattle Times, Rick Lund)

In this photo provided by Francisco Rodriguez, rescue workers form a human chain as they begin to remove a woman who reaches out from a smashed pickup truck that fell into the Skagit River after the collapse of the Interstate 5 bridgeThursday, May 23, 2013, in Mount Vernon, Wash. (AP Photo/Francisco Rodriguez)

In this photo provided by Francisco Rodriguez, rescue boats approach victims at their vehicles in the Skagit River after the collapse of the Interstate 5 bridge there minutes earlier Thursday, May 23, 2013, in Mount Vernon, Wash. (AP Photo/Francisco Rodriguez)

Rescue workers look for victims after a portion of the Interstate 5 bridge collapsed into the Skagit River in Mount Vernon, Wash., Thursday, May 23, 2013. (AP Photo/Everett Daily Herald, Jon Bauer)

A span of highway bridge sits in the Skagit River May 24, 2013 after collapsing near the town of Mt Vernon, Washington late Thursday. The bridge collapse that sent cars and drivers tumbling into a frigid river in Washington state appears to have been caused when a semi-trailer truck carrying an oversize load struck a bridge support beam, officials said on Friday. The truck crossed the bridge safely before a portion of the structure collapsed, sending two vehicles and a mass of concrete and steel into the Skagit River Thursday evening. Three people had to be rescued, officials said. REUTERS/Cliff DesPeaux

A portion of the Interstate-5 bridge is submerged after it collapsed into the Skagit river dumping vehicles and people into the water in Mount Vernon, Wash., Thursday, May 23, 2013 according to the Washington State Patrol. (AP Photo/Joe Nicholson)

Jeane Ebeling, right, of Mount Vernon, and Allee McCoy, second from right, of Mount Vernon look at the collapsed bridge in the Skagit River. A portion of the Interstate-5 bridge is submerged after it collapsed into the Skagit river dumping vehicles and people into the water in Mount Vernon, Wash., Thursday, May 23, 2013 according to the Washington State Patrol. (AP Photo/Joe Nicholson)

A portion of the Interstate-5 bridge is submerged after it collapsed into the Skagit river dumping vehicles and people into the water in Mount Vernon, Wash., Thursday, May 23, 2013 according to the Washington State Patrol. (AP Photo/Joe Nicholson)

A portion of the Interstate 5 bridge is submerged after it collapsed into the Skagit River in Mount Vernon, Wash., Thursday, May 23, 2013. (AP Photo/The Seattle Times, Rick Lund)

In this photo provided by NWCN, people look on after the Interstate 5 bridge collapsed over the Skagit River in Skagit County, Wash., Thursday, May 23, 2013. The four-lane bridge over the Skagit River collapsed about 7 p.m., Trooper Mark Francis said. There was no immediate estimate of how many people were in the water or whether there were any injuries or deaths, he said. (AP Photo/NWCN, Selina Dziura)

A truck that was carrying an oversize load sits parked southbound on Interstate 5 immediately south of the collapsed portion of the highway bridge at the Skagit River Friday, May 24, 2013, in Mount Vernon, Wash. The Washington State Patrol says the truck was hauling a too-tall load of drilling equipment from Canada to Vancouver, Wash., when it hit an overhead bridge girder on the major interstate between Seattle and Canada, sending a section of the span and two vehicles into the Skagit River Thursday evening. All three occupants suffered only minor injuries. (AP Photo/Elaine Thompson)

A portion of the Interstate 5 bridge is submerged after it collapsed into the Skagit River dumping vehicles and people into the water as rescuers watch from the collapsed section of Interstate 5 and hovercraft search for survivors below in Mount Vernon, Wash., Thursday, May 23, 2013. (AP Photo/The Seattle Times, Rick Lund)

A portion of the Interstate-5 bridge is submerged after it collapsed into the Skagit river dumping vehicles and people into the water in Mount Vernon, Wash., Thursday, May 23, 2013 according to the Washington State Patrol. (AP Photo/Joe Nicholson)

Vehicles can be seen in the water after a section of the Interstate 5 bridge over the Skagit River, north of Seattle, collapsed Thursday evening, May 23, 2013. The four-lane bridge collapsed at about 7 p.m., Trooper Mark Francis said. (AP Photo/Skagit Valley Herald, Gina Cole)

People look on after the Interstate 5 bridge collapsed over the Skagit River in Mount Vernon, Wash., Thursday, May 23, 2013. (AP Photo/The Seattle Times, Rick Lund)

A portion of the Interstate 5 bridge is submerged after it collapsed into the Skagit River dumping vehicles and people into the water in Mount Vernon, Wash., Thursday, May 23, 2013 according to the Washington State Patrol. (AP Photo/Skagit Valley Herald, Frank Varga)

A portion of the Interstate 5 bridge is submerged after it collapsed into the Skagit River dumping vehicles and people into the water in Mount Vernon, Wash., Thursday, May 23, 2013 according to the Washington State Patrol. (AP Photo/Skagit Valley Herald, Frank Varga)

A portion of the Interstate-5 bridge is submerged after it collapsed into the Skagit river dumping vehicles and people into the water in Mount Vernon, Wash., Thursday, May 23, 2013 according to the Washington State Patrol. (AP Photo/Joe Nicholson)

People offer spontaneous prayer after an Interstate 5 bridge collapsed over the Skagit River between Mt. Vernon and Burlington, Wash. on Thursday, May 23, 2013. Two cars and one travel trailer went in the water. There were no know fatalities. (AP Photo/seattlepi.com, Joshua Trujillo)

MT. VERNON, WASHINGTON - MAY 23: Crews survey the scene of a bridge collapse on Interstate 5 into the Skagit River May 23, 2013 near Mt. Vernon, Washington. People and cars were thrown into the river when the four-lane bridge collapsed. At least three people were rescued from the water but there have been no reported deaths. Police are investigating witnesses reports that a semi-truck may have struck the bridge causing the collapse. (Stephen Brashear/Getty Images)

MT. VERNON, WASHINGTON - MAY 23: Washington State Governor Jay Inslee addresses the media at the scene of a bridge collapse into the Skagit River on Interstate 5 on May 23, 2013 near Mt. Vernon, Washington. People and cars were thrown into the river when the four-lane bridge collapsed. At least three people were rescued from the water but there have been no reported deaths. Police are investigating witnesses reports that a semi-truck may have struck the bridge causing the collapse. (Stephen Brashear/Getty Images)

A collapsed section of the Interstate 5 bridge over the Skagit River is seen in an aerial view Friday, May 24, 2013. Part of the bridge collapsed Thursday evening, sending cars and people into the water when a an oversized truck hit the span, the Washington State Patrol chief said. Three people were rescued from the water. Washington Gov. Jay Inslee on Friday declared a state of emergency in three counties around the bridge, saying that the bridge collapse has caused extensive disruption, impacting the citizens and economy in Skagit, Snohomish and Whatcom Counties. (AP Photo/The Seattle Times, Mike Siegel)

A hover craft crew examines a upside down car as they look for victims after a portion of the Interstate 5 bridge collapsed into the Skagit River in Mount Vernon, Wash., Thursday, May 23, 2013. (AP Photo/Everett Daily Herald, Jennifer Buchanan)

In this photo provided by Francisco Rodriguez, rescue boats approach victims at their vehicles in the Skagit River after the collapse of the Interstate 5 bridge there minutes earlier Thursday, May 23, 2013, in Mount Vernon, Wash. (AP Photo/Francisco Rodriguez)

Rescue workers look for victims after a portion of the Interstate 5 bridge collapsed into the Skagit River in Mount Vernon, Wash., Thursday, May 23, 2013. (AP Photo/Everett Daily Herald, Jon Bauer)

An upside down vehicle rests in the water after a portion of the Interstate 5 bridge collapsed into the Skagit River in Mount Vernon, Wash., Thursday, May 23, 2013. (AP Photo/Everett Daily Herald, Jennifer Buchanan)

A damaged truck sits in the water on a portion of the Interstate-5 bridge that is submerged after it collapsed into the Skagit river dumping vehicles and people into the water in Mount Vernon, Wash., Thursday, May 23, 2013 according to the Washington State Patrol. (AP Photo/Joe Nicholson)

In this photo provided by Francisco Rodriguez, a man is seen sitting atop a car that fell into the Skagit River after the collapse of the Interstate 5 bridge there minutes earlier Thursday, May 23, 2013, in Mount Vernon, Wash. (AP Photo/Francisco Rodriguez)

A person looks from the south bank of the Skagit River across to the collapsed portion of the Interstate 5 bridge Friday, May 24, 2013, in Mount Vernon, Wash. A truck carrying an oversize load struck the four-lane bridge on the major thoroughfare between Seattle and Canada, sending a section of the span and two vehicles into the Skagit River below Thursday evening. All three occupants suffered only minor injuries. At an overnight news conference, Washington State Patrol Chief John Batiste blamed the collapse on a tractor-trailer carrying a tall load that hit an upper part of the span. (AP Photo/Elaine Thompson)

A car is seen in the water as a span of highway bridge sits in the Skagit River May 24, 2013 after collapsing near the town of Mt Vernon, Washington late Thursday. The bridge collapse that sent cars and drivers tumbling into a frigid river in Washington state appears to have been caused when a semi-trailer truck carrying an oversize load struck a bridge support beam, officials said on Friday. The truck crossed the bridge safely before a portion of the structure collapsed, sending two vehicles and a mass of concrete and steel into the Skagit River Thursday evening. Three people had to be rescued, officials said. REUTERS/Cliff DesPeaux

A collapsed portion of the Interstate 5 bridge lies at the Skagit River Friday, May 24, 2013, in Mount Vernon, Wash. A truck carrying an oversize load struck the four-lane bridge on the major thoroughfare between Seattle and Canada, sending a section of the span and two vehicles into the Skagit River below Thursday evening. All three occupants suffered only minor injuries. At an overnight news conference, Washington State Patrol Chief John Batiste blamed the collapse on a tractor-trailer carrying a tall load that hit an upper part of the span. (AP Photo/Elaine Thompson)

Photos: Interstate 5 bridge collapses in Washington state

A section of the Interstate 5 bridge over the Skagit River between Mount Vernon and Burlington, Washington collapsed on Thursday evening, May 23, 2013, according to the Washington State Patrol. The four-lane bridge collapsed about 7 p.m., Trooper Mark Francis said.
Francis said he had no immediate estimate of how many people were in the water or whether there were any injuries or deaths. A Skagit Valley Herald reporter at the scene said a sheriff's office rescue boat has arrived and rescue crews were looking for people in the water.
Read more: I-5 bridge collapses in NW Wash.; people in water